NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic
NFL says Guardian Caps reduced concussions by over 50%
NFL Notes: Chargers-Saints Takeaways, New MNF Crew Debuts Tonight, More
What are Guardian Caps, and why are some NFL players wearing them during training camp?
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
NFL makes Guardian Caps mandatory for many positions through second preseason game - NBC Sports
Concussions: Can cap keep football players' heads in game? – Orange County Register
Concussions: Can cap keep football players' heads in game? – Orange County Register
Guardian Caps Exceed NFL's Expectations - Guardian Sports
Ban on helmet covers sparks controversy
Guardian Cap Debuts at Training Camps League-wide
NFL hopes to reduce head injuries with helmet experiment
NFL Makes Ruling On Players Wearing Guardian Cap During Game - The Spun: What's Trending In The Sports World Today
Certain NFL players must wear Guardian Caps through second preseason game
NFL CMO Dr. Sills on Guardian Caps Mandate >> Guardian Sports